Cycloclasticus is a genus in the phylum Pseudomonadota (Bacteria).

[1] The name Cycloclasticus derives from:Greek noun kuklos, circle or ring; Neo-Latin adjective clasticus -a -um (from Greek adjective klastos -ē -on, broken in pieces), breaking; Neo-Latin masculine gender noun cycloclasticus, ring-breaker.

[2] The genus contains a single species,[2] namely C. pugetii ( Dyksterhouse et al. 1995, (Type species of the genus).

; Neo-Latin genitive case masculine gender noun pugetii, of Puget, named in honor of Peter Puget, a British naval officer who participated in the Vancouver Expedition and for whom Puget Sound was named.

)[3] Other candidate species, e.g., "C. spirillensus," have not been formally recognized.